I installed this to warn about the possibly-unexpected consequences
of those options:
2006-08-09 Paul Eggert <[EMAIL PROTECTED]>
* doc/coreutils.texi (dd invocation): Warn about oflag=append without
conv=notrunc. See Debian bug 373736.
* src/dd.c (usage): Warn about oflag=append without conv=notrunc.
Index: doc/coreutils.texi
===================================================================
RCS file: /fetish/cu/doc/coreutils.texi,v
retrieving revision 1.344
diff -p -u -r1.344 coreutils.texi
--- doc/coreutils.texi 8 Aug 2006 22:11:49 -0000 1.344
+++ doc/coreutils.texi 9 Aug 2006 21:15:33 -0000
@@ -7302,6 +7302,9 @@ system.
Write in append mode, so that even if some other process is writing to
this file, every @command{dd} write will append to the current
contents of the file. This flag makes sense only for output.
+If you combine this flag with the @[EMAIL PROTECTED] operand,
+you should also specify @samp{conv=notrunc} unless you want the
+output file to be truncated before being appended to.
@item direct
@opindex direct
Index: src/dd.c
===================================================================
RCS file: /fetish/cu/src/dd.c,v
retrieving revision 1.195
diff -p -u -r1.195 dd.c
--- src/dd.c 9 Jul 2006 17:01:38 -0000 1.195
+++ src/dd.c 9 Aug 2006 21:15:33 -0000
@@ -458,7 +458,7 @@ Each CONV symbol may be:\n\
\n\
Each FLAG symbol may be:\n\
\n\
- append append mode (makes sense only for output)\n\
+ append append mode (makes sense only for output; conv=notrunc
suggested)\n\
"), stdout);
if (O_DIRECT)
fputs (_(" direct use direct I/O for data\n"), stdout);
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